Bevel



(No Model.)

2 Sheets-Sheet 1. C. TILLER.

BEVEL.

No. 868,434. Patented Aug. 16, 1887.

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(No Model.) 2 Sheets-Sheet 2.

C. TILLER.

BBVEL.

No. 368,434. Patented Aug. 16.1887.

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N. PETERS. PhomALhhagrapnu, washington. D. C.

UNITED STATES PATENT OFFICE.

QHARLES TILLER, OF MILFORD, MASSACHUSETTS.

BEVEL.

SPECIFICATION forming part of Letters Patent No. 368,434, dated August16, 1887. Application filed March Q8, 1857. Serial No. 232,712. (Nomodel.)

To @ZZ whom 'it may concern.-v

Beit known that I, CHARLES TILLER, a subject of the Queen of GreatBritain, residing at Milford, in the county of Vorcester and q State ofMassachusetts, have invented certain new and useful Improvements inCombinatiou-Tools, of which the following is a specification.

My invention relates to draftinginstruments, and my object is to furnishin a compact and convenient forni a combined instrument for the use ofarchitects, draftsmen, and builders, which may be used as a square,bevel, protractor, plotter, plumb, and rule.

15 The invention consists in various details of construction which adaptthe instrument for these different uses, and is fully represented in theaccompanying drawings, in which- Figure l is a plan view of mycombinationtool when closed. Fig. 2 represents an edge View of the samewhen closed. Fig. 8 isaplan View showing its use as a bevel and squarecombined. Fig. et shows a triangle with leveling device. Fig. 5 is adetail section to illustrate the method of fastening' the sectionstogether at one end. Fig. 6 shows a plan view of one ofthe pivotedblades. Fig. 7 isa View of the opposite side of the same. Fig. 8 is aview of the instrument arranged as a T-square and plotter.

My combination-tool is composed of four sections, two of which on theoutside form a stock, andthe remaining two, which are inclosed by andpivoted in the stock, are movable blades, each having one free end andso pivoted that they can be putinto different positions and anglesrelatively to the stock and secured in any of such positions.

The mechanical construction of the instrument may be best understood byreference to Figs. 2 and 5.

A and A represent the outside strips or plates which form the stock orframe, and by which the movable blades B B are inclosed, and betweenwhich they are pivoted. Each strip A A has a head or end, a, ofjusttwice the thickness of the main part ofthe strip, the thickness of theenlarged portion being equal to that of each of the blades B B', so thatwhen the parts are in place the free ends of the inner blades bearagainst the shoulders thus formed in the outer strips, Fig. 5. Aperforation, I), is made near each end ofeach of the strips A A and inone end of each blade B B', and a screw, c, passed through at each end.The screw has a feather which engages with a slot, c2, in each strip AA', to prevent it from turning after it is in its proper position. Theflat heads of the screws are countcrsunk in the face of the strips A A',so as to be flush with the surface, Fig. 5, and when in place aresecured by a Washer, d, and a nut, c, at each end of the instrument. Thescrews can be inserted from either side. Vhen the parts are thus securedin place andthe nuts loosened, the blades B B can move freely on thescrews as pivots and be clamped by the nuts at any point.

The outer face of each strip A A is first divided by longitudinal andtransverse ceutral lines extending, respectively, from end to end andfrom side to side, Fig. 1, and continuing over the edge. Then a circleis struck at each end from the pivot-screw as a center, by which aremarked the degree-lines from fifteen degrees on each side to one hundredand eighty degrees at the end, andthe degreelines are continued on theedge of each blade. This marking is precisely similar on both strips AA. The central longitudinal lines, as well as the degree-lines, are alsocarried across the flat circular heads of the screws c, Fig. S.

Figs. 6 and 7 show front and rear views of one of the pivoted blades B Bof this instrument, and a description of one of these blades appliestoboth. It is provided with a longitudinal slot, f, for a purposehereinafter specilied. On its face is a central longitudinal line,f,extending from end to end, and on each side of the slot is a scale ofinches, Fig. (i, while upon one sideis markedseparate halfinch andquarterinch scales for architects use.

The Various parts ofthe instrument can be so combined as to form asquare, a bevel, a protractor, a plotter, a level, and a plumb, as wellas a rule with scales. Thus Fig. 4 shows a combined carpenters squareand bevel, in which'the square is formed by causing the central line ofone of the blades B or B to register with the ninety-degree mark on onen ofthe strips A or A', and then clamping the parts together at thatend, while the angle for the bevel is ascertained and fixed in the samemanner with the other blade. `The two movable blades may be broughttogether to form a triangle, as shown by dotted lines in Fig. 4,

and a small pin, g, passed through the regis' tering holes g in theblades, Figs. 6 and 7, which pin will support aplumb-bob, as shown. Thecombined square and bevel may also be formed at the same end of thestock, Fig. 3, by reversing one of the strips A or A', so as to bringtheir thickened ends together, then pivoting both blades B B at theopposite end, and then securing both ends by the screws, when thethickness of the combined parts will be equal throughout.

The instrument may be arranged for use as a T-square and plotter, asshown in Fig. 8. lThis may be done in either of two ways-iirst, takingthe parts combined, as in Fig. 3, but passing the fastening-screwthrough the slot in one of the blades, so that such blade can be securedat right angles to form a T-square, or allowed to slide for use inplotting; secondly, by removing one of the blades entirely and formingthe T-square bysecuring the other to 1 the outside of the stock by meansof the screw and slot.

One side of the slotf, Fig. 7, has an offset to receive the head of thescrew and allow it to lie ush with the surface of the blade B or B', asthe case may be. y p

The mechanical construction of the parts having been fully described, itis believed that specific and exact description of every use to whichthe instrument may be put in various kinds of drafting and measuring isunnecessary, as such uses will be readily understood by those skilled inthe art.

I claim as my invention- 1. The combination, with the outer strips eachhaving one end or head, a, of double thickness, forming shoulders at oneend of the stock, of a pair of blades pivoted at the opposite endbetween the said strips and adapted to bear at their free ends againstsaid shoulders, and clamping devices at each end, substantially asdescribed.

2. rBhe combination, with a pair of strips forming the stock, of thepivoted and slotted blades having the perforations g at their free ends,said perforations being adapted to register when the blades are adjustedto form an -isosceles triangle and receive a pin for supporting aplumb-bob, substantially as described.

3. The combination, with the reversible strips A A, each having athickened end, of a pair of blades, B B', which together are of the samethickness as either of the enlarged ends of the strips A A', and meansfor pivoting and clamping the said blades B B between the strips A A',substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

CHARLES TILL-ER.

Witnesses:

J. E. WALKER, LnMUnL MEELLETT.

